Improvement in head-blocks of saw-mills



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WILLIAM B.- TRUNICK, OF LOUISVILLE,- KENTCKY, ASSIGNOR T() KAT THANIEL B.v CONNEL, OF SAME" PLAGE.-

Letters Patent No. 106,744, dated August- 23, 1870*.

IMPROVEMENT IN H.EADBLOCK`S OF SAW-MILLS.

The Schedule referred to in these Letters Patent and makin'g part of the same.

I, WILLIAM B. TRUNICK, vof the city of Louisville, county of Jelferson and State of Kentucky, have invented a c ertaiu new auduseful Improvement in Setting Logs and Operating the Head-Blocks of Circular'` saw Mills, of which the following is a specitica-tion.-

The iirst part of my invention consists in providing each screw of the headblocks with a friction-pulley,

.made of cast-iron, of any suitable size, keyed on se-A curely, on the outside of which there is small bevel or miter-wheel, keyed on the end, which works into similar wheels on a small shaft secured to the side of the carriage, extending from one head-block to the other, there being usually three in number, and made stationary,'so that, when power is applied to any one, it is transmitted to all equally alike, which is done by means of stationary friction-pulleys, placed in the ioor below the carriage, and driven from the engine below by bands or otherwise, the motionof each being the reverse. The outside bearings of the shafts ot these pulleys are made in the ends of an oscillating lever, secured to the millfrarne at the center, one end of which connects with the arm of a small leverrunning up through the door at any convenient place, to be operated by the person attending the saw. And

in order to operate lhis invention, it is only necessaryto 'state that, as all the head-blocks are stationary on the carriage, the main one is so set as that the pulley on the screw will be immediately over the driving friction-pulley in the oor when the saw runs out, when it is only necessary to raise it against the pulley on the head-block, and it will more the log until checked by the pin in a wheel hereafter mentioned; but when necessary to reverse the motion to back the carriage, raise the other pulley, which will back it; or, when necessary tot put on a log, any of the pulleys on the different headblocks can be used in like manner.

The second part of my invention consists in a small pinion on the screw of the main head-block, immediately behind the i'ction-pnlley, working into alarge wheel secured toa block sliding on top of the carriage, in orde-r that it 'may be thrown ont of gear. This last-named wheel is perforated with numerous holes, in which a small Apin is used for gauging, and as a check to the machinery, andmay be made of any required size or number of cogs, or any number of holes to suit't-he different thicknesses of lumber required to be cut, the objectot' the holesjn the wheel being for the purpose ofinserting a small pin in them to act as a gauge for the thicknesses of the lumber'by being changed from one hole to the other, and, at the same time, to operate as a cheek to prevent the pulleys from turning too far, so as to gauge incorrectly. The end of the pin is so arranged as to strike a stop on lop of the carriage-on the opposite side of the wheel; but when it is necessary to operate the head-blocks iu putting on a log, this/wheel is thrown out of gear for the time being.

It will be seen, by reference to the drawing, that the part to which the driving-pulleys are attached is secured permanently to the under side of the carriage; but it is not so intended when in practical use, but merely represents the loorot' the mill, oirwhich the carriage runs when provided withways for that 'purlpose.

' erated.

D 1)V D are mter-wheels, by which power is transmitted to the coimecting-shaft. i

F is the connectingshaft.

E E Evare the wheels by whiclrit is driven.

G G are the bearings of the shaft.

J J are the friction-pulleys, by which the machine.

is driven.

I is the lever, by which the pulleys J J' are operated.

k is the door of the mill. Although it is here attached to the carriage, it is not so intended to be when in use.

-H is the gauge-wheel for regulating Jthe thickness of the lumber.

N is the sliding-block.

I are the holes and L is the'gauge-pin, which is changed from one hole to the other in the wheel, according to the,y thickness of the lumber to be cut.

Having thus fully described the drawing, therefore I do not ela-im anything asl new in the carriage-frame or the sliding head-blocks; but

Witnesses E. F. HUYoK, Jolis MOTSGHMAN. 

